Software is the set of instructions that tell a computer what it needs to do.
There are two kinds of software: the System Software which includes the Operating System and Applications Software.
Abbreviated OS, the Operating System is the resource manager which transforms sectors, bytes, interrupts and ports into files, folders, processes, and the user-interfaces with which you can interact. Examples include: Microsoft Windows (XP, Vista, or 7), any flavor of Linux, and Mac OS X (An apple version of Unix).
Also called user programs, pieces of applications software do the specific things you want.
The Operating System runs the computer and the Applications Software. It makes sure that the Hardware and the Applications Software understand each other. This makes it the most important piece of software on the computer. The Operating System also comes with utilities. These are pieces of Applications Software that mostly deal with managing data. You can also buy Third Party utilities, which means a different company made them than made the Operating System.
Utilities Programs that manage, repair, and optimize data on a computer. A basic set comes with every OS.
Applications Software does the specific things you want the computer to do, Whereas the Operating System is general instructions to the computer for controlling the Hardware, Applications Software is specific instructions that work together with the Operating System to do work for you.
There are as many different kinds of Applications Software as there are things you could want to do with a computer, however the most common are word processing, spreadsheet, presentation, and database software and all computer games. Word processing software is used to create documents, which are formatted pages of text, such as letters, memos, reports or essays. Spreadsheet software organizes data, usually numbers, into columns and rows. It is used mostly for accounting and has many features for doing mathematical operations. Presentation software is used to make virtual (or, simulated) slide shows and usually have all sorts of exciting features for animations and sounds that you just can’t do in a normal slide show. Database software is an advanced way of organizing complicated information in simple formats. A database is your electronic filing cabinet.
Most computers come pre-installed with an OS called Microsoft® Windows®. Most OS's and programs have the same features whether they use Windows or not, but all computers running Windows will have these features with these names. The thing we did in the last chapter with the box that comes up when you turn on your computer is called logging in. The screen you see after logging in is called the Desktop. Most things on a computer are named after things in real life, and they are usually used similarly too. Just like a real desktop the desktop on a computer is where you go to access all your data. However, a real desktop has a flat horizontal surface.
You can replace the Operating System with another whether or not your system gets a virus. The most common replacement Operating System is called Linux. It is free to download and install and software for it is freely available via the Internet.
Desktop The desktop is the area that appears right after logging in. It contains a background picture (wallpaper),icons and the taskbar.
On the desktop are pictures with text labels under them, these pictures are called icons because they represent something else. If you move or get rid of an icon, all that means is that you have to access what they represent a different way, you haven’t gotten rid of the application software the icon is representing. Icons usually represent programs, but sometimes they represent collections of data. Double-clicking (clicking twice in rapid succession) on one of these icons will open whatever it represents, the text tells you what it represents.
Icons A tiny picture that represents a program, folder, or program function.
There is a bar that is usually at the bottom of the desktop, however it may also be on any other side. If you cannot see it, then move the cursor to the edge where it is and it will come up. It is called the task-bar.
Taskbar The taskbar is the bar along one side of the desktop. It is used for launching programs or opening the window of an open program.
Along the main part of the task-bar is a list of all open programs, clicking on one element of this list will put that program’s window (the box that a program is viewed in) on top of all other open windows. Over on one side of the task-bar is a clock; beside the clock are a bunch of icons that represent open ‘invisible’ programs. These are programs that are always running and do things ‘behind the scenes’. This area is called the system tray. On the main part of the task-bar there is sometimes a small group of icons, this is called the quick-launch bar. Clicking on one of these icons opens whatever it represents.
System Tray The system tray holds icons for programs currently running ‘behind-the-scenes’.
On the opposite side of the task-bar from the clock and the system tray is a button. A button (or command button) is just like a real button, when it is pushed (clicked) it does something. Some buttons have text on them that say what they do, and some have icons representing what they do. Some have both.
(Command) Buttons Buttons do something when you click on them. They may be labeled by text, an icon, or both.
The quick-launch icons are also buttons. Some buttons are raised to look like real buttons and some only raise up when you hover (put the cursor on top of) them. The button on the other side of the start-bar from the clock and system tray is called the start-button. When you click the start-button it opens the start-menu. The start-menu has icons for more programs and data collections, although it is usually programs.
Start button The Start button is a button that opens the start-menu.
Start menu The Start menu contains icons for all installed programs and data collections, usually for programs.
The icons that are on the desktop, the quick-launch bar, and the start-menu are usually shortcuts. On the desktop shortcuts are often indicated by a small symbol on top of the icon (). Shortcuts are what I meant earlier when I said ‘if you move or get rid of an icon, all that means is that you have to access what they represent a different way, you haven’t gotten rid of the actual thing’. Icons represent all data collections and programs even if they are not shortcuts, however normally the ones on the desktop and in the start-menu are shortcuts.
Shortcuts Icons that are only links to the things those icons represent.
The difference between icons and shortcuts is important so be sure you understand it. An icon is any picture that is meant to convey what something is. The icon on the start-button represents the fact that it is a major part of Windows, which is why it is a Windows logo. Shortcuts are a link to a program or data collection; the icon on a shortcut represents whatever the shortcut opens, however the same icon would be on the real thing as well. A Venn Diagram can maybe better show this, see Figure 2.2.
You open whatever is linked to by each shortcut on the start-menu by clicking on it. If any icon has a right-arrow beside it, then hovering over it or clicking on it will make a sub-menu (a menu inside a menu) come out with more shortcuts on it.
Everything we just talked about is part of the Windows interface. An interface is just anything that goes between two or more things. This interface goes between you and the computer, you could also say that the Operating System is the interface between the hardware and software.
Interface An interface, just as the name suggests, is anything that acts as or creates a medium of interaction or communication between multiple things. A user-interface is the means of interaction between (you)the user and the computer.
There are some standard things that are on most user-interfaces. We have already talked about one, buttons. These things are called controls. Below is a table of some of the more common controls, starting with buttons:
You can get a basic description of what any control does by hovering your mouse over it. A little thing with text will pop up. This is called a tool-tip (or a ToolTip).
Besides these there are also menus. Menus all operate the same way as the start-menu. Some of them are found at the tops of programs. These are called main-menus or simply menus. Other menus are opened by right-clicking (pushing the right mouse button over something). These are called popup-menus.